Also sprach Myk Melez:
> For example, XPCOM supports component registration and overriding
> at runtime. But it isn't clear that Firefox needs those features,
> now that it no longer supports XUL extensions (unless perhaps for
> system extensions).
I believe this is a feature we rely on for bypassing invalid TLS
certificates in Marionette by replacing nsICertOverrideSerivce .
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